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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0d37a3065fa48d003ace04b24ff6f2098721516c407335f65dfc5720224a67' 
  AND token = 'Cl6BFNTrwR1GJ5NpA29YuQls8ud1SRk9b/zeX1EROqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}